BS EN 1991-1-3:2003+A1:2015

This standard BS EN 1991-1-3:2003+A1:2015 Eurocode 1. Actions on structures is classified in these ICS categories:

• 91.080 Structures of buildings
• 91.060.20 Roofs
• 91.080.17 Aluminium structures
• 91.010.30 Technical aspects

(1) EN 1991‑1‑3 gives guidance to determine the values of loads due to snow to be used for the structural design of buildings and civil engineering works.

(2) This Part does not apply for sites at altitudes above 1 500 m, unless otherwise specified.

(3) Annex A gives information on design situations and load arrangements to be used for different locations.

(4) Annex B gives shape coefficients to be used for the treatment of exceptional snow drifts.

(5) Annex C gives characteristic values of snow load on the ground based on the results of work carried out under a contract specific to this Eurocode, to DGIII / D3 of the European Commission. The objectives of this Annex are:

• to give information to National Competent Authorities to help them to redraft and update their national maps;

• to help to ensure that the established harmonised procedures used to produce the maps in this Annex are used in the member states for treating their basic snow data.

(6) Annex D gives guidance for adjusting the ground snow loads according to the return period.

(7) Annex E gives information on the bulk weight density of snow.

(8) This Part does not give guidance on specialist aspects of snow loading, for example:

• impact snow loads resulting from snow sliding off or falling from a higher roof;

• the additional wind loads which could result from changes in shape or size of the construction works due to the presence of snow or the accretion of ice;

• loads in areas where snow is present all year round;

• ice loading;

• lateral loading due to snow (e.g. lateral loads exerted by drifts);

• snow loads on bridges.